<template>
  <div>
    <!-- 面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false"
      :expand-type="false" show-index index-text="#" border :show-row-hover="false">
        <template slot="isok" slot-scope="scope">
        <!-- 是否有效 -->
          <i v-if="scope.row.cat_deleted === false" class="el-icon-success" style="color: lightgreen;"></i>
          <i v-else class="el-icon-error" style="color: red;"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditCateDialog(scope.row.cat_id)">编辑</el-button>
          <el-button type="danger" size="mini" icon="el-icon-delete" @click="deleteCate(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页组件 -->
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="queryInfo.pagenum"
        :page-sizes="[1, 2, 5, 10]" :page-size="queryInfo.pagesize" layout="total, sizes, prev, pager, next, jumper"
        :total="total">
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed"
      :close-on-click-modal="false">
      <!-- 添加分类表单 -->
      <el-form :model="addCateForm" :rules="cateFormRules" ref="addCateFormRef"
      label-width="100px">
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <!--options:数据源 props:用来指定配置对象 -->
          <el-cascader
              v-model="selectedKeys"
              :options="parentCateList"
              :props="cascaderProps" change-on-select
              @change="parentCateChange" clearable>
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate()">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改分类对话框 -->
    <el-dialog title="修改分类" :visible.sync="editCateVisible" width="50%"
      :close-on-click-modal="false">
      <!-- 修改用户表单区域 -->
      <el-form ref="editCateFormRef" :model="editCateForm" :rules="cateFormRules" label-width="100px">
        <!-- 角色名称 -->
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 查询分页参数
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      catelist: [],
      // 总分页条数
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        }, {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        }, {
          label: '排序',
          type: 'template',
          template: 'order'
        }, {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      // 添加分类对话框显示
      addCateDialogVisible: false,
      editCateVisible: false,
      // 添加分类的表单数据
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      editCateForm: {},
      cateFormRules: {
        cat_name: [
          {
            required: true,
            message: '请输入分类名称',
            trigger: 'blur'
          }
        ]
      },
      parentCateList: [],
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败！')
      }
      // 把数据列表，赋值给catelist
      this.catelist = res.data.result
      // 数据总数
      this.total = res.data.total
    },
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange (newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 展示添加分类按钮
    showAddCateDialog () {
      this.addCateDialogVisible = true
      this.getParentCateList()
    },
    // 获取1，2级分类
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类信息失败！')
      }
      this.parentCateList = res.data
    },
    parentCateChange () {
      // 选中了分类
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else { // 未选中了分类
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 添加分类
    async addCate () {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error('分类创建失败！')
        this.$message.success('分类创建成功')
        // 重新获取用户列表
        this.getCateList()
        // 隐藏对话框
        this.addCateDialogVisible = false
      })
    },
    // 关闭添加分类对话框
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    // 打开修改分类页面
    async showEditCateDialog (id) {
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询分类信息失败')
      }
      console.log(res.data)
      this.editCateForm = res.data
      this.editCateVisible = true
    },
    deleteCate (id) {
      this.$confirm('此操作将永久删除该分类, 是否继续?', '提示',
        { confirmButtonText: '确定', cancelButtonText: '取消', type: 'warning' })
        .then(async () => {
          const { data: res } = await this.$http.delete('categories/' + id)
          if (res.meta.status !== 200) {
            return this.$message.error('删除分类失败！')
          }
          // this.$message({ type: 'success', message: '删除成功!' })
          this.$message.success('删除分类成功!')
          this.getCateList()
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          })
        })
    },
    // 修改分类信息
    editCate () {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          'categories/' + this.editCateForm.cat_id,
          {
            cat_name: this.editCateForm.cat_name
          })
        if (res.meta.status !== 200) return this.$message.error('分类信息修改失败！')
        this.$message.success('分类信息修改成功')
        // 重新获取用户列表
        this.getCateList()
        // 隐藏对话框
        this.editCateVisible = false
      })
    }
  }
}
</script>

<style lang="less" scoped>
.treeTable{
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>
